If you haven't been to the second dungeon yet, you should start climbing death mountain from kakariko village. Look for an exit on the west side (not the exit to the graveyard, there's a second exit going out to death mountain).

help

ok this has been sent befor but i still did not get it i have got the 3rd monkey i have gone back to the place where the chest is haging from the roof with the light things you soot with a sling shop and thing came out. well the monkey with the red hat is swing on the rop to get to the other side and the whit one is swing on the ather rop and the 3rd monkey is on like a light post what do i do now.

Sorry but I really don't remember the details of each monkey, hope this helps though:

Spoiler Alert!

Main Hall: This room is the main hub, and you'll be returning at least a
few times. Take out the Big Skulltula on the platform, and the Deku Babas
on the floor. Also, note the Bombling in the northwest corner. Smack it,
then toss it at the north wall to blow it open to find a chest with
20 RUPEES. On the platform, light the four torches to raise a bridge to
the north door. Open the chest here for a DUNGEON MAP, then proceed
through the door. Note that raising the bridge blocks off your access to
the 20 Rupee chest, if you didn't get it, but you'll get a chance to
extinguish those torches if you wish, later.

Windy Canyon: You won't be here, long. You'll notice a big monkey show
up and cast a boomerang, which will cut the bridge down. Go back the way
you came.

Main Hall: Head to the platform and the monkey will hop on the rope to
your right. Jump out towards her to get a hand. Press A to let go at the
right time to swing to the western door. Head on through.

Watery Cavern: Head to the right in this tunnel to find another Bombling and
a cracked wall right behind it. Blow one up with the other to find OOCCOO.
If you didn't know (or she doesn't explain it well enough), she can warp
you out of a dungeon if you find yourself running low on supplies, then
warp you right back to the room you left. Anyway, proceed left to exit
the small tunnel to the room. There's a Deku Baba here. Follow the
monkey across. When she stops, scared, use the Slingshot to knock down
the large Skulltula hanging. Cross over to the locked door. Now what?
Well, first, hop down into the water and swim into a hole in the NW corner
of the room to find 10 RUPEES, then climb back out. You'll now want to
exit by the unlocked door on the north wall.

Windy Canyon: Note the weird little bridges. I call this "Windy Canyon"
because the wind periodically blows here, spinning the propellers on the
bridges, causing them to rotate. Cross the bridge to the next door.

Bridge Crossroads: There's no wind blowing here, and the bridge isn't
pointing your way, so all you can do here is take the SMALL KEY in the
nearby chest, and proceed back across the Windy Canyon to...

Watery Cavern: Proceed west to the locked door.

Western Cage Room: Yes, there are more monkeys. Cross the rickety bridge
and lament as it collapses behind you. Proceed to the bottom of the room
and roll into the pillar twice in quick succession to knock the cage down.
Once you free the monkey, two Bokoblins will attack, so learn them some
manners. Also down here on the floor is a chest with 10 RUPEES. Once
you've cleaned up, follow the monkeys up the bridge, and swing across the
two of them to the other side, and leave the room. Proceed through the
Watery Cavern back to...

Main Hall: Now that you have two monkeys, go to the eastern part of the
middle platform and the male monkey will let you across to the east door.
Burn the web down in front of it and proceed.

Grassy Cavern: In this room, you'll find two Hebi Babas, which can
detach from their roots and live on, so slice them up, good. You'll also
find Pod Babas. These guys can only be destroyed with explosives. Head up
the stairs to find a convenient Bombling. Strike it and hurriedly toss it
into the Pod just up the northeast stairs to kill it. Now, you can cross
to the eastern door. Of course, there's a big rock blocking that door,
so grab another Bombling and quickly toss it to the rock. You should have
just enough time. Despite all that work, we don't want to go that way, just
yet. Face south from this door and slingshot the Skullwalltulas on the vine
wall. Hop over to the vine wall and climb up. Before going through the
door up here, grab a nearby Bombling and toss it into the Pod down on the
ground floor to blow it up. Behind that Pod is a chest with a PIECE OF
HEART. Now, climb the stairs and the vines back up to the south-facing
door.

Southern Cage Room: Your enemy is in front of you: A Major Deku Baba.
Despite its size and appearance, it's really not that difficult. Let it
reach out to you, then swat it. Do so about eight or so times and the main
mouth will be destroyed. Now, find a Bombling in the room and toss it in
the leftover Pod. This will liberate the SMALL KEY. Use it to open the
cage and free the monkey. Now, you can return to the Grassy Cavern and
use the eastern door.

Eastern Cage Room: First of all, hop off to the ground floor and roll into
the pillar on your left to drop the chest with the SMALL KEY in it for the
cage in this room. Now, to actually get there. Well, the obvious answer
is to light the remaining two torches in this room, which will raise the
rest of the wooden platforms. The problem is the Tile Worms that occupy
this area. Notice them poking their heads out as they watch your approach.
Do NOT step on them, as you will be unpleasantly surprised and take
damage. At this point, you have no means to combat them, so just avoid
the tiles they're under, light the two torches, and climb up the platforms.
Take out the Big Skulltula here, and free the monkey. Before you leave,
there are vines on the north wall you can climb to reach a chest with
20 RUPEES. Return to the Grassy Cavern, and then to...